Sum answers are in different order so witch one

Television sizes are based on the length of the diagonal of the television's rectangular screen. so, for example, a 70-inch television is a television having a diagonal screen length of 70 inches. if a 70 inch television's diagonal forms a 29°angle with the base of the screen, what is the vertical height (1) of the screen to the nearest inch? 70 inhin

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Aquadratic equation in standard from is written ax^2= bx+c, where a, b and c are real numbers and a is not zero?